Air treatment device



FIG. 1 is a front perspective view of the air treatment device;

FIG. 2 is a front side elevational view thereof;

FIG. 3 is a back side elevation view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the air treatment device that form no part of the claimed design. 

CLAIM The ornamental design for an air treatment device, as shown and described. 